Shooting optical lens

Abstract

The invention relates to the field of optical lenses, and discloses a camera shooting optical lens which is composed of a first prism, a second lens, a third lens, a fourth lens, a fifth lens and a reflection structure which are sequentially arranged from the object side to the image side. A first reflecting surface is arranged between the object side surface and the image side surface of the first prism, both the object side surface and the image side surface of the first prism are curved surfaces, and a lens group formed by the fourth lens and the fifth lens can be movably adjusted along the optical axis of the shooting optical lens, so that the shooting optical lens can be switched between the maximum focal length and the minimum focal length; the combined focal length of the second lens and the third lens is f23, the combined focal length of the fourth lens and the fifth lens is f45, the center curvature radiuses of the object side face and the image side face of the fourth lens are R7 and R8 respectively, and the relation that f23 / f45 is larger than or equal to-0.90 and smaller than or equal to-0.40 is met. (R7 + R8) / (R7-R8) is greater than or equal to-40.00 and less than or equal to 10.00.

Description

Technical Field

[0001] The present invention relates to the field of optical lenses, and in particular to a camera optical lens suitable for portable terminal devices such as smart phones and digital cameras, as well as camera devices such as monitors and PC lenses. Background Art

[0002] In recent years, with the rise of various smart devices, the demand for miniaturized camera optical lenses has been increasing. Due to the shrinking pixel size of photosensitive devices and the trend towards lightweight, portable electronic products with high functionality, miniaturized camera optical lenses with excellent imaging quality have become the mainstream in the market. To achieve optimal imaging quality, multi-lens structures are often used. Furthermore, with technological advancements and increasing user demands, as the pixel size of photosensitive devices continues to shrink and the system's requirements for imaging quality continue to increase, lens-prism combinations are gradually emerging in lens designs. There is an urgent need for periscope telephoto camera optical lenses with excellent optical characteristics, a compact size, and sufficient aberration compensation. Summary of the Invention

[0003] In view of the above problems, the main object of the present invention is to provide a camera optical lens, which has excellent optical properties and meets the design requirements of long focus and miniaturization.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention provides a camera optical lens, which is composed of a first prism with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens, a fifth lens with negative refractive power, and a reflective structure, which are arranged in sequence from the object side to the image side; wherein a first reflecting surface is provided between the object side surface and the image side surface of the first prism, and the object side surface and the image side surface of the first prism are both curved surfaces, the second lens and the third lens form a first lens group, the fourth lens and the fifth lens form a second lens group, and the second lens group is capable of being moved and adjusted along the optical axis of the camera optical lens, so that the camera optical lens can be switched between a first state and a second state, wherein the camera The optical lens has a maximum focal length in the first state, and the camera optical lens has a minimum focal length in the second state; the reflective structure includes a second reflective surface and a third reflective surface, and the light emitted from the image side surface of the fifth lens is reflected by the second reflective surface and the third reflective surface and then projected onto the imaging surface; the combined focal length of the second lens and the third lens is f23, the combined focal length of the fourth lens and the fifth lens is f45, the central curvature radius of the object side surface of the fourth lens is R7, and the central curvature radius of the image side surface of the fourth lens is R8, and the following relationship is satisfied: -0.90≤f23 / f45≤-0.40; -40.00≤(R7+R8) / (R7-R8)≤-10.00.

[0005] Preferably, the focal length of the camera optical lens in the first state is fA, the image height of the camera optical lens is IH, and the following relationship is satisfied: 12.00≤fA / IH≤15.8.

[0006] Preferably, the Abbe number of the second lens is v2, and satisfies the following relationship: 60.00≤v2≤82.00.

[0007] Preferably, the on-axis thickness of the second lens is T2, the on-axis thickness of the third lens is T3, the on-axis thickness of the fourth lens is T4, the on-axis thickness of the fifth lens is T5, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 0.10≤(T2+T3+T4+T5) / TTL≤0.15.

[0008] Preferably, the focal length of the second lens is f2, the axial thickness of the second lens is T2, and the following relationship is satisfied: 4.00≤f2 / T2≤6.10.

[0009] Preferably, the object side surface of the first prism is convex at the near axis, and the image side surface of the first prism is concave at the near axis; the focal length of the camera optical lens in the first state is fA, the focal length of the first prism is fp1, the central curvature radius of the object side surface of the first prism is R1, the central curvature radius of the image side surface of the first prism is R2, the sum of the on-axis distance from the object side surface of the first prism to the first reflecting surface and the on-axis distance from the first reflecting surface to the image side surface of the first prism is T1, the total optical length of the camera optical lens is TTL, and satisfies the following relationship: -14.61≤fp1 / fA≤96.17; -40.40≤(R1+R2) / (R1-R2)≤41.00; 0.19≤T1 / TTL≤0.23.

[0010] Preferably, the object side surface of the second lens is convex at the paraxial point, and the image side surface of the second lens is convex at the paraxial point; the focal length of the camera optical lens in the first state is fA, the focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens is R3, the central curvature radius of the image side surface of the second lens is R4, the axial thickness of the second lens is T2, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 0.24≤f2 / fA≤0.38; -0.84≤(R3+R4) / (R3-R4)≤-0.62; 0.052≤T2 / TTL≤0.066.

[0011] Preferably, the object side surface of the third lens is concave at the paraxial position, and the image side surface of the third lens is convex at the paraxial position; the focal length of the camera optical lens in the first state is fA, the focal length of the third lens is f3, the central curvature radius of the object side surface of the third lens is R5, the central curvature radius of the image side surface of the third lens is R6, the axial thickness of the third lens is T3, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -1.96≤f3 / fA≤-1.10; -11.08≤(R5+R6) / (R5-R6)≤-4.98; 0.009≤T3 / TTL≤0.036.

[0012] Preferably, the object side surface of the fourth lens is concave at the paraxial position, and the image side surface of the fourth lens is convex at the paraxial position; the focal length of the camera optical lens in the first state is fA, the focal length of the fourth lens is f4, the axial thickness of the fourth lens is T4, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -10.6≤f4 / fA≤8.95; 0.021≤T4 / TTL≤0.025.

[0013] Preferably, the object side surface of the fifth lens is concave at the paraxial position, and the image side surface of the fifth lens is convex at the paraxial position; the focal length of the camera optical lens in the first state is fA, the focal length of the fifth lens is f5, the central curvature radius of the object side surface of the fifth lens is R9, the central curvature radius of the image side surface of the fifth lens is R10, the axial thickness of the fifth lens is T5, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -6.68≤f5 / fA≤-0.38; -22.64≤(R9+R10) / (R9-R10)≤-1.06; 0.013≤T5 / TTL≤0.035.

[0014] Preferably, the second lens is made of glass.

[0015] The beneficial effects of the present invention are that the camera optical lens according to the present invention has excellent optical properties, and has the characteristics of long focus and miniaturization, and is particularly suitable for mobile phone camera optical lens assemblies and WEB camera optical lenses composed of high-pixel CCD, CMOS and other camera elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0017] Figure 1 2 is a schematic structural diagram of the imaging optical lens according to the first embodiment of the present invention in a first state;

[0018] Figure 2 yes Figure 1 Schematic diagram of axial aberration of the camera optical lens shown;

[0019] Figure 3 yes Figure 1 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0020] Figure 4 yes Figure 1 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0021] Figure 5 2 is a schematic structural diagram of the imaging optical lens according to the first embodiment of the present invention in the second state;

[0022] Figure 6 yes Figure 5 Schematic diagram of axial aberration of the camera optical lens shown;

[0023] Figure 7 yes Figure 5 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0024] Figure 8 yes Figure 5 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0025] Figure 9 is a schematic structural diagram of a second embodiment of the imaging optical lens of the present invention in a first state;

[0026] Figure 10 yes Figure 9 Schematic diagram of axial aberration of the camera optical lens shown;

[0027] Figure 11 yes Figure 9 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0028] Figure 12 yes Figure 9 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0029] Figure 13 is a schematic structural diagram of the camera optical lens of the second embodiment in the second state;

[0030] Figure 14 yes Figure 13 Schematic diagram of axial aberration of the camera optical lens shown;

[0031] Figure 15 yes Figure 13 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0032] Figure 16 yes Figure 13 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0033] Figure 17 is a schematic structural diagram of the camera optical lens of the third embodiment in the first state;

[0034] Figure 18 yes Figure 17 Schematic diagram of axial aberration of the camera optical lens shown;

[0035] Figure 19 yes Figure 17 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0036] Figure 20 yes Figure 17 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0037] Figure 21is a schematic structural diagram of the camera optical lens of the third embodiment in the second state;

[0038] Figure 22 yes Figure 21 Schematic diagram of axial aberration of the camera optical lens shown;

[0039] Figure 23 yes Figure 21 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0040] Figure 24 yes Figure 21 Schematic diagram of field curvature and distortion of the camera optical lens shown. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the present invention more apparent, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in various embodiments of the present invention to facilitate a better understanding of the present invention. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the present invention can still be implemented.

[0042] See attached Figure 1 、 5 , 9, 13, 17, 21, the technical solution of the present invention provides a camera optical lens 10, 20, 30. The camera optical lens 10, 20, 30 is composed of a first prism P1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive or negative refractive power, a fifth lens L5 with negative refractive power, and a reflective structure, which are arranged in sequence from the object side to the image side. A first reflecting surface S1 is provided between the object side surface and the image side surface of the first prism P1, and both the object side surface and the image side surface of the first prism P1 are curved surfaces. The second lens L2 and the third lens L3 form a first lens group, the fourth lens L4 and the fifth lens L5 form a second lens group, and the second lens group is capable of being moved and adjusted along the optical axis of the camera optical lens 10, 20, 30, so that the camera optical lens 10, 20, 30 can be switched between a first state and a second state, wherein the focal length of the camera optical lens 10, 20, 30 is the largest in the first state, and the focal length of the camera optical lens 10, 20, 30 is the smallest in the second state; the reflective structure includes a second reflective surface S2 and a third reflective surface S3, and the light emitted from the image side surface of the fifth lens L5 is reflected by the second reflective surface S2 and the third reflective surface S3 and then projected onto the imaging surface.

[0043] The two curved surfaces of the object side and the image side of the first prism P1 can compress the thickness of the first prism P1 in the direction perpendicular to the optical axis, so that the incident light propagates along the optical axis. The thickness of the first prism P1 in the direction perpendicular to the optical axis is reduced, making the camera optical lens miniaturized. Figure 1 、 5 As shown in Figures 9, 13, 17, and 21, the object side surface and image side surface of the first prism P1 are set as curved surfaces, which can compress the thickness of the first prism P1 in the z-axis direction, so that the incident light propagates along the x-axis direction, and the thickness of the first prism P1 in the z-axis direction is reduced.

[0044] The second lens group consisting of the fourth lens L4 and the fifth lens L5 is arranged to be movable and adjustable along the optical axis. By moving the second lens group consisting of the fourth lens L4 and the fifth lens L5, the imaging optical lenses 10, 20, and 30 can be switched between a first state and a second state. Specifically, the first state refers to the imaging optical lenses 10, 20, and 30 focusing on infinity, and the focal length of the imaging optical lenses 10, 20, and 30 is maximum in the first state; the second state refers to the imaging optical lenses 10, 20, and 30 focusing on 2000 mm, and the focal length of the imaging optical lenses 10, 20, and 30 is minimum in the second state.

[0045] The reflective structure reflects the incident light twice and reflects the incident light in a direction perpendicular to the incident light, so as to compress the length of the camera optical lens in the x-axis direction and miniaturize the camera optical lens.

[0046] The combined focal length of the second lens L2 and the third lens L3 is defined as f23, and the combined focal length of the fourth lens L4 and the fifth lens L5 is defined as f45, satisfying the following relationship: -0.90≤f23 / f45≤-0.40. This specifies the ratio of the combined focal length f23 of the second lens L2 / the third lens L3 to the combined focal length f45 of the fourth lens L4 / the fifth lens L5. By rationally allocating the optical focal length of the camera optical lens, a smooth transition of light is achieved, thereby improving image quality.

[0047] The central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and the central curvature radius of the image-side surface of the fourth lens L4 is defined as R8, satisfying the following relationship: -40.00≤(R7+R8) / (R7-R8)≤-10.00. This specifies the shape of the fourth lens L4, which is beneficial for correcting the astigmatism and distortion of the camera optical lens, making the distortion |Distortion| ≤0.5%, and reducing the possibility of vignetting.

[0048] Preferably, the focal length of the camera optical lens 10, 20, 30 in the first state is fA, the image height of the camera optical lens 10, 20, 30 is IH, and the following relationship is satisfied: 12.00≤fA / IH≤15.8, which specifies the ratio of the focal length of the camera optical lens in the first state to the image height of the camera optical lens. The camera optical lens that meets the conditions has a longer focal length when the image height is fixed, which helps to improve the system magnification.

[0049] Preferably, the Abbe number of the second lens L2 is v2, which satisfies the following relationship: 60.00≤v2≤82.00, which specifies the Abbe number of the first prism L2. Within this range, material properties can be effectively distributed and chromatic aberration can be effectively corrected to make the chromatic aberration |LC|≤2.0μm.

[0050] Preferably, the on-axis thickness of the second lens L2 is T2, the on-axis thickness of the third lens L3 is T3, the on-axis thickness of the fourth lens L4 is T4, and the on-axis thickness of the fifth lens L5 is T5. The total optical length of the camera optical lenses 10, 20, and 30 is TTL, satisfying the following relationship: 0.10≤(T2+T3+T4+T5) / TTL≤0.15. By reasonably allocating the air gaps between the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, and reasonably allocating the thicknesses of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, it is helpful to reduce the difficulty of molding in the actual production process and improve the yield rate.

[0051] Preferably, the focal length of the second lens element L2 is f2, and the on-axis thickness of the second lens element L2 is T2, and the following relationship is satisfied: 4.00 ≤ f2 / T2 ≤ 6.10. This defines a range of the ratio of the focal length of the second lens element L2 to the on-axis thickness of the second lens element L2. When the focal length f2 of the second lens element L2 and the on-axis thickness T2 of the second lens element L2 meet these conditions, they help mitigate variations in the incident angle of light at wide viewing angles, allowing light to propagate smoothly through the optical imaging lens assembly. Meanwhile, the refractive power of the second lens element L2 is maintained, thereby improving chromatic aberration and enhancing image quality.

[0052] When the above conditions are met, the camera optical lenses 10, 20, and 30 have good optical performance and meet the design requirements of telephoto and miniaturization. According to the characteristics of the camera optical lenses 10, 20, and 30, the camera optical lenses 10, 20, and 30 are particularly suitable for mobile phone camera optical lens assemblies and WEB camera optical lenses composed of high-pixel CCD, CMOS and other camera elements.

[0053] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0054] Preferably, the object-side surface of the first prism P1 is convex at the near-axis, and the image-side surface of the first prism P1 is concave at the near-axis;

[0055] The focal length of the camera optical lens in the first state is defined as fA, and the focal length of the first prism P1 is fp1, satisfying the relationship: -14.61≤fp1 / fA≤96.17. This conditional expression stipulates the ratio of the focal length fp1 of the first prism P1 to the focal length fA of the camera optical lens 10, 20, 30 in the first state. Through the reasonable distribution of optical focal length, the camera optical lens 10, 20, 30 has better imaging quality and lower sensitivity.

[0056] The central curvature radius of the object side surface of the first prism P1 is defined as R1, and the central curvature radius of the image side surface of the first prism P1 is defined as R2, satisfying: -40.40≤(R1+R2) / (R1-R2)≤41.00; this conditional expression can effectively control the shape of the first prism P1, and within the range specified by the conditional expression, it is beneficial to correct axial chromatic aberration and improve the image quality of the system.

[0057] The sum of the on-axis distance from the object side of the first prism P1 to the first reflecting surface S1 and the on-axis distance from the first reflecting surface S1 to the image side of the first prism P1 is defined as T1, and the total optical length of the camera optical lens 10, 20, and 30 is TTL, satisfying: 0.19≤T1 / TTL≤0.23. The conditional formula stipulates the ratio range of the sum T1 of the on-axis distance of the first prism P1 and the total optical length TTL of the camera optical lens 10, 20, and 30. Within the limited range, it is beneficial to control the total optical length TTL of the camera optical lens and realize the miniaturized design of the camera optical lens.

[0058] The object-side surface of the second lens L2 is convex at the paraxial direction, and the image-side surface of the second lens L2 is convex at the paraxial direction. The object-side surface of the second lens L2 can also be set as a concave surface at the paraxial direction, and the image-side surface of the second lens L2 can also be set as a concave surface at the paraxial direction.

[0059] The focal length of the camera optical lenses 10, 20, and 30 in the first state is defined as fA, and the focal length of the second lens L2 is defined as f2, satisfying the following relationship: 0.24≤f2 / fA≤0.38. This specifies the ratio of the focal length f2 of the second lens L2 to the focal length f of the camera optical lens in the first state. Through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity.

[0060] The central curvature radius of the object-side surface of the second lens L2 is defined as R3, and the central curvature radius of the image-side surface of the second lens L2 is defined as R4, satisfying the following relationship: -0.84≤(R3+R4) / (R3-R4)≤-0.62; which specifies the ratio of the sum of the central curvature radius R3 of the object-side surface and the central curvature radius R4 of the image-side surface of the second lens L2 to the difference between the central curvature radius R3 of the object-side surface and the central curvature radius R4 of the image-side surface of the second lens L2. This can effectively control the shape of the second lens L2, and within the range specified by the conditional expression, is beneficial to correcting axial chromatic aberration and improving the image quality of the system.

[0061] The axial thickness of the second lens L2 is defined as T2, and the total optical length of the camera optical lenses 10, 20, and 30 is defined as TTL, which satisfies the following relationship: 0.052≤T2 / TTL≤0.066. Within the conditional range, miniaturization is achieved.

[0062] The object-side surface of the third lens L3 is concave at the paraxial direction, and the image-side surface of the third lens L3 is convex at the paraxial direction. Alternatively, the object-side surface of the third lens L3 may be convex at the paraxial direction, and the image-side surface of the third lens L3 may be concave at the paraxial direction.

[0063] The focal length of the camera optical lenses 10, 20, and 30 in the first state is defined as fA, and the focal length of the third lens L3 is defined as f3, satisfying the following relationship: -1.96≤f3 / fA≤-1.10. This specifies the ratio of the focal length f3 of the third lens L3 to the focal length f of the camera optical lens in the first state. Through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity.

[0064] The central curvature radius of the object side surface of the third lens L3 is defined as R5, and the central curvature radius of the image side surface of the third lens L3 is defined as R6, satisfying the following relationship: -11.08≤(R5+R6) / (R5-R6)≤-4.98. This specifies the shape of the third lens L3 and the ratio of the sum of the central curvature radius R5 of the object side surface and the central curvature radius R6 of the image side surface of the third lens L3 to the difference between the central curvature radius R5 of the object side surface and the central curvature radius R6 of the image side surface of the third lens L3. This can effectively control the shape of the third lens L3. Within the range specified by the conditional expression, it is beneficial to the molding of the third lens L3, can alleviate the degree of deflection of light passing through the lens, and effectively reduce aberrations.

[0065] The axial thickness of the third lens L3 is defined as T3, and the total optical length of the camera optical lenses 10, 20, and 30 is defined as TTL, which satisfies the following relationship: 0.009≤T3 / TTL≤0.036. Within the conditional range, miniaturization is achieved.

[0066] The object-side surface of the fourth lens L4 is concave at the paraxial direction, and the image-side surface of the fourth lens L4 is convex at the paraxial direction. Alternatively, the object-side surface of the fourth lens L4 may be convex at the paraxial direction, and the image-side surface of the fourth lens L4 may be concave at the paraxial direction.

[0067] The focal length of the camera optical lenses 10, 20, and 30 in the first state is defined as fA, and the focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: -10.6≤f4 / fA≤8.95. This specifies the ratio of the focal length f4 of the fourth lens L4 to the focal length fA of the system in the first state. Through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity.

[0068] The axial thickness of the fourth lens L4 is defined as T4, and the total optical length of the camera optical lenses 10, 20, and 30 is defined as TTL, which satisfies the following relationship: 0.021≤T4 / TTL≤0.025. Within the conditional range, miniaturization is achieved.

[0069] The object-side surface of the fifth lens L5 is concave at the paraxial direction, and the image-side surface of the fifth lens L5 is convex at the paraxial direction. The object-side surface of the fifth lens L5 can also be set as a convex surface at the paraxial direction, and the image-side surface of the fifth lens L5 can also be set as a concave surface at the paraxial direction.

[0070] The focal length of the camera optical lenses 10, 20, and 30 in the first state is defined as fA, and the focal length of the fifth lens L5 is defined as f5, satisfying the following relationship: -6.68≤f5 / fA≤-0.38, which specifies the ratio of the focal length f5 of the fifth lens L5 to the focal length f of the camera optical lens. Through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity.

[0071] The central curvature radius of the object-side surface of the fifth lens L5 is defined as R9, and the central curvature radius of the image-side surface of the fifth lens L5 is defined as R10, and the following relationship is satisfied: -22.64≤(R9+R10) / (R9-R10)≤-1.06. This specifies the ratio of the sum of the central curvature radius R9 of the object-side surface and the central curvature radius R10 of the image-side surface of the fifth lens L5 to the difference between the central curvature radius R9 of the object-side surface and the central curvature radius R10 of the image-side surface of the fifth lens L5. This can effectively control the shape of the fifth lens L5 and is beneficial to correcting problems such as off-axis aberrations within the range specified by the conditional expression.

[0072] The axial thickness of the fifth lens L5 is defined as T5, and the total optical length of the camera optical lenses 10, 20, and 30 is defined as TTL, which satisfies the following relationship: 0.013≤T5 / TTL≤0.035. Within the conditional range, miniaturization is achieved.

[0073] The reflective structure has a second reflective surface S2 and a third reflective surface S3. Light passes through the first prism P1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 along the optical axis. After passing through the fifth lens L5, the light reaches the second reflective surface S2. The second reflective surface S2 reflects the light to the third reflective surface S3. The third reflective surface S3 also reflects the light and then passes through the optical filter GF and the image surface Si. After the light is reflected twice by the second reflective surface S2 and the third reflective surface S3, the reflection angle of the light is perpendicular to the incident angle, thereby reducing the thickness of the camera optical lens and making it more compact.

[0074] In the present invention, the first prism P1 is made of glass, the second lens L2 is made of glass, the third lens L3, the fourth lens L4, and the fifth lens L5 are all made of plastic, and the reflective structure is made of glass or plastic. The first prism P1, the third lens L3, the fourth lens L4, and the fifth lens L5 can also be made of other materials.

[0075] In the present invention, an optical element such as an optical filter GF is disposed between the third reflective surface S3 and the image surface Si of the reflective structure, wherein the optical filter GF can be a glass cover plate or an optical filter. The optical filter GF can also be disposed at other locations.

[0076] In the present invention, an aperture S is further provided. The aperture S is provided between the first prism P1 and the second lens L2. The aperture S may also be provided at other positions.

[0077] The image height of the camera optical lenses 10, 20, and 30 is IH, the total optical length of the camera optical lenses 10, 20, and 30 is TTL, and the following relationship is satisfied: TTL / IH≤16.96, which is conducive to miniaturization. Preferably, 14.88≤TTL / IH≤16.96 is satisfied.

[0078] The aperture value FNO of the camera optical lenses 10, 20, and 30 is less than or equal to 3.59, which can improve the imaging performance of the camera optical lenses.

[0079] The focal length of the camera optical lenses 10, 20, and 30 in the first state is fA, the total optical length of the camera optical lenses 10, 20, and 30 is TTL, and the following relationship is satisfied: fA / TTL<0.93, which is conducive to system miniaturization. Preferably, 0.83<fA / TTL<0.93 is satisfied.

[0080] The following examples illustrate the imaging optical lenses 10, 20, and 30 of the present invention. The symbols used in the examples are as follows: The focal length, axial thickness, center radius of curvature, and axial thickness are expressed in mm.

[0081] TTL: total optical length (the axial thickness from the object side of the first prism P1 to the image surface Si), in mm;

[0082] Aperture value FNO: refers to the ratio of the effective focal length of the camera optical lens to the entrance pupil diameter;

[0083] 1.0 Image height of field of view IH: the height of the field of view corresponding to the effective pixel of the sensor (that is, half of the diagonal length of the effective pixel area of ​​the sensor);

[0084] 1.0 Field of view FOV: the field of view angle corresponding to the effective pixels of the sensor;

[0085] Image height of MIC field of view IHm: the field of view height expanded beyond 1.0 to prevent assembly deviation;

[0086] MIC field of view angle FOVm: the field of view angle corresponding to the MIC field of view image height.

[0087] Next, the technical solution of the present invention is described in detail with three embodiments.

[0088] (First embodiment)

[0089] The first prism P1 has positive refractive power and is made of glass;

[0090] The second lens L2 has positive refractive power and is made of glass. Its object-side surface is convex at the paraxial direction, and its image-side surface is convex at the paraxial direction.

[0091] The third lens L3 has negative refractive power and is made of plastic. Its object-side surface is concave at the paraxial axis, and its image-side surface is convex at the paraxial axis.

[0092] The fourth lens L4 has negative refractive power and is made of plastic. Its object-side surface is concave at the paraxial axis, and its image-side surface is convex at the paraxial axis.

[0093] The fifth lens element L5 has negative refractive power and is made of plastic. Its object-side surface is concave at the paraxial axis, and its image-side surface is convex at the paraxial axis.

[0094] The aperture S is disposed between the first prism P1 and the second lens L2.

[0095] Table 1 shows design data of the imaging optical lens 10 according to the first embodiment of the present invention.

[0096]

Table 1

[0097]

[0098] Table 2 shows the optical parameters of the imaging optical lens 10 according to the first embodiment of the present invention in the first state and the second state, respectively.

[0099]

Table 2

[0100] In the first state In the second state f 48.533 47.47 FOV 8.22 8.16 FNO 3.56 3.59 T34 2.036 2.336 T5-S2 10.000 9.700

[0101] The meanings of the symbols are as follows.

[0102] OBJ: object;

[0103] S: aperture;

[0104] R: radius of curvature at the center of the optical surface;

[0105] R1: the central curvature radius of the object side surface of the first prism P1 at the paraxial position;

[0106] Rf1: the central curvature radius of the first reflecting surface of the first prism P1 at the paraxial position;

[0107] R2: the central curvature radius of the first prism P1 at the paraxial side of the image side;

[0108] R3: the central curvature radius of the object-side surface of the second lens L2;

[0109] R4: the central curvature radius of the image-side surface of the second lens L2;

[0110] R5: central radius of curvature of the object side surface of the third lens L3;

[0111] R6: central curvature radius of the image-side surface of the third lens L3;

[0112] R7: central curvature radius of the object side surface of the fourth lens L4;

[0113] R8: central curvature radius of the image-side surface of the fourth lens L4;

[0114] R9: the central radius of curvature of the object side surface of the fifth lens L5;

[0115] R10: central radius of curvature of the object side surface of the fifth lens L5;

[0116] Rf2: the central curvature radius of the second reflecting surface S2 of the reflecting structure;

[0117] Rf3: the central curvature radius of the third reflecting surface S3 of the reflecting structure;

[0118] d: the on-axis thickness of the lens and the on-axis thickness between lenses;

[0119] ST: the on-axis distance from the aperture S to the object side of the first prism P1;

[0120] T1S1: the on-axis distance from the object-side surface of the first prism P1 to the first reflecting surface S1;

[0121] T1S2: the on-axis distance from the first reflecting surface S1 to the first prism P1;

[0122] T12: The on-axis distance from the image-side surface of the first prism P1 to the object-side surface of the second lens L2; ​​T2: The on-axis thickness of the second lens L2;

[0123] T23: The on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3; T3: The on-axis thickness of the third lens L3;

[0124] T34: the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4; T4: the on-axis thickness of the fourth lens L4;

[0125] T45: the on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5; T5: the on-axis thickness of the fifth lens L5;

[0126] T5-S2: the on-axis distance from the image-side surface of the fifth lens L5 to the second reflecting surface S2;

[0127] S2-S3: the axial thickness from the second reflecting surface S2 to the third reflecting surface S3;

[0128] S3-IR: the on-axis distance from the third reflecting surface S3 to the object-side surface of the optical filter GF; TIR: the on-axis thickness of the optical filter GF;

[0129] TIR-IMG: the on-axis distance from the image side of the optical filter GF to the image plane Si;

[0130] nd: refractive index of d-line (d-line is green light with a wavelength of 550nm);

[0131] nd1: refractive index of the d-line of the first prism P1;

[0132] nd2: the refractive index of the second lens L2 at the d-line;

[0133] nd3: the refractive index of the third lens L3 at the d-line;

[0134] nd4: the refractive index of the fourth lens L4 at the d-line;

[0135] nd5: the refractive index of the fifth lens L5 at the d-line;

[0136] ndg: refractive index of the d-line of the optical filter GF;

[0137] vd: Abbe number;

[0138] vd1: Abbe number of the first prism P1;

[0139] vd2: Abbe number of the second lens L2;

[0140] vd3: Abbe number of the third lens L3;

[0141] vd4: Abbe number of the fourth lens L4;

[0142] vd5: Abbe number of the fifth lens L5;

[0143] vdg: Abbe number of the optical filter GF.

[0144] Table 3 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.

[0145]

Table 3

[0146]

[0147]

[0148] For convenience, the aspheric surface of each lens surface is represented by the aspheric surface shown in the following formula (1). However, the present invention is not limited to the aspheric surface polynomial form represented by the formula (1).

[0149] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r

[0150] 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0151] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at a distance r from the optical axis and the tangent plane tangent to the vertex on the aspheric axis).

[0152] In addition, the following Table 10 also lists various parameters in the first embodiment and the values ​​corresponding to the prescribed parameters in the conditional expressions.

[0153] Figure 2 、 Figure 3 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 530 nm, 470 nm, and 435 nm after passing through the imaging optical lens 10 of the first embodiment (in the first state) are shown respectively. Figure 4 FIG1 shows a schematic diagram of field curvature and distortion of light having a wavelength of 555 nm after passing through the imaging optical lens 10 of the first embodiment (in the first state). Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0154] Figure 6 、 Figure 7 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 530 nm, 470 nm, and 435 nm after passing through the imaging optical lens 10 of the first embodiment (in the second state) are shown respectively. Figure 8 FIG2 shows a schematic diagram of field curvature and distortion of light having a wavelength of 555 nm after passing through the imaging optical lens 10 of the first embodiment (in the second state). Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0155] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 13.635 mm, the image height IH of the 1.0 field of view is 3.50 mm, the field of view angle FOV of the 1.0 field of view is 8.22°, the image height Ihm of the MIC field of view is 3.65 mm, and the field of view angle FOVm of the MIC field of view is 8.57°. The camera optical lens 10 meets the design requirements of telephoto and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0156] (Second embodiment)

[0157] The meanings of the symbols in the second embodiment are the same as those in the first embodiment.

[0158] The imaging optical lens 20 of the second embodiment differs from the imaging optical lens 10 of the first embodiment in that the fourth lens L4 has positive refractive power.

[0159] Figure 9 、 Figure 13 FIG. 2 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0160] Table 4 shows design data of the imaging optical lens 20 according to the second embodiment of the present invention.

[0161]

Table 4

[0162]

[0163]

[0164] Table 5 shows the optical parameters of the imaging optical lens 20 according to the second embodiment of the present invention in the first state and the second state, respectively.

[0165]

Table 5

[0166] In the first state In the second state f 54.75 53.13 FOV 7.24 7.243 FNO 3.50 3.52 T34 1.947 2.164 T5-S2 10.000 9.783

[0167] Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0168]

Table 6

[0169]

[0170]

[0171] Figure 10 、 Figure 11 Schematic diagrams showing axial aberration and lateral chromatic aberration of light with wavelengths of 650 nm, 610 nm, 555 nm, 530 nm, and 470 nm after passing through the imaging optical lens 20 of the second embodiment (in the first state) are shown respectively. Figure 12 FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 20 of the second embodiment (in the first state). Figure 12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0172] Figure 14 、 Figure 15 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 530 nm, and 470 nm after passing through the imaging optical lens 20 of the second embodiment (in the second state) are respectively shown. Figure 16 FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 20 of the second embodiment (in the second state). Figure 16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0173] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 15.643 mm, the image height IH of the 1.0 field of view is 3.50 mm, the field of view angle FOV of the 1.0 field of view is 7.24°, the image height Ihm of the MIC field of view is 3.65 mm, and the field of view angle FOVm of the MIC field of view is 7.55°. The camera optical lens 20 meets the design requirements of telephoto and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0174] (Third embodiment)

[0175] The meanings of the symbols in the third embodiment are the same as those in the first embodiment.

[0176] Figure 17 、 Figure 21 FIG. 1 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0177] Table 7 shows design data of the imaging optical lens 30 according to the third embodiment of the present invention.

[0178]

Table 7

[0179]

[0180] Table 8 shows the optical parameters of the imaging optical lens 30 according to the third embodiment of the present invention in the first state and the second state, respectively.

[0181]

Table 8

[0182] In the first state In the second state f 43.8 43.11 FOV 9.10 9.01 FNO 3.50 3.53 T34 4.784 5.371 T5-S2 10.000 9.413

[0183] Table 9 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0184]

Table 9

[0185]

[0186]

[0187] Figure 18 、 Figure 19 Schematic diagrams respectively show axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 530 nm, and 470 nm after passing through the imaging optical lens 30 of the third embodiment (in the first state). Figure 20 FIG. 3 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 30 of the third embodiment (in the first state). Figure 20 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0188] Figure 22 、 Figure 23 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 530 nm, and 470 nm after passing through the imaging optical lens 30 of the third embodiment (in the second state) are shown respectively. Figure 24 FIG. 3 is a schematic diagram showing the field curvature and distortion of light having a wavelength of 555 nm after passing through the imaging optical lens 30 (in the second state) of the third embodiment. Figure 24 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0189] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 12.514 mm, the image height IH of the 1.0 field of view is 3.50 mm, the field of view angle FOV of the 1.0 field of view is 9.10°, the image height Ihm of the MIC field of view is 3.65 mm, and the field of view angle FOVm of the MIC field of view is 9.48°. The camera optical lens 30 meets the design requirements of telephoto and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0190] Table 10 below lists the numerical values ​​corresponding to the conditional expressions in the three implementation modes according to the above conditional expressions.

[0191]

Table 10

[0192] Parameters and Conditionals First embodiment Second embodiment Third embodiment f23 / f45 -0.668 -0.900 -0.400 (R7+R8) / (R7-R8) -20.478 -39.992 -10.008 fA / IH 13.867 15.181 12.514 v2 81.640 60.080 74.670 (T2+T3+T4+T5) / TTL 0.123 0.150 0.100 f2 / T2 4.445 4.001 6.004 fA 48.533 53.133 43.800 fp1 1193.885 800.000 4212.073 f2 16.144 13.658 16.348 f3 -94.767 -64.391 -48.248 f4 -514.065 489.546 -75.789 f5 -34.232 -20.844 -292.503 TTL 55.617 59.338 52.112

[0193] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present invention, and that in actual applications, various changes may be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A camera optical lens, characterized in that: The camera optical lens is composed of a first prism with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens, a fifth lens with negative refractive power, and a reflective structure, which are arranged in sequence from the object side to the image side; wherein a first reflecting surface is provided between the object-side surface and the image-side surface of the first prism, both the object-side surface and the image-side surface of the first prism are curved surfaces, the second lens and the third lens form a first lens group, the fourth lens and the fifth lens form a second lens group, the second lens group is movable and adjustable along the optical axis of the camera optical lens, so that the camera optical lens switches between a first state and a second state, wherein the focal length of the camera optical lens is maximum in the first state and minimum in the second state; the reflecting structure includes a second reflecting surface and a third reflecting surface, and light emitted from the image-side surface of the fifth lens is reflected by the second reflecting surface and the third reflecting surface before being projected onto the imaging surface; The combined focal length of the second lens and the third lens is f23, the combined focal length of the fourth lens and the fifth lens is f45, the central curvature radius of the object side surface of the fourth lens is R7, and the central curvature radius of the image side surface of the fourth lens is R8, and the following relationship is satisfied: -0.90≤f23 / f45≤-0.40; -40.00≤(R7+R8) / (R7-R8)≤-10.

00.

2. The imaging optical lens according to claim 1, wherein: The focal length of the camera optical lens in the first state is fA, the image height of the camera optical lens is IH, and the following relationship is satisfied: 12.00≤fA / IH≤15.

8.

3. The imaging optical lens according to claim 1, wherein: The Abbe number of the second lens is v2, and satisfies the following relationship: 60.00≤v2≤82.00。 4. The imaging optical lens according to claim 1, wherein: The on-axis thickness of the second lens is T2, the on-axis thickness of the third lens is T3, the on-axis thickness of the fourth lens is T4, the on-axis thickness of the fifth lens is T5, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 0.10≤(T2+T3+T4+T5) / TTL≤0.

15.

5. The imaging optical lens according to claim 1, wherein: The focal length of the second lens is f2, the axial thickness of the second lens is T2, and the following relationship is satisfied: 4.00≤f2 / T2≤6.

10.

6. The imaging optical lens according to claim 1, wherein: The object side surface of the first prism is convex at the near axis, and the image side surface of the first prism is concave at the near axis; The focal length of the camera optical lens in the first state is fA, the focal length of the first prism is fp1, the central curvature radius of the object side surface of the first prism is R1, the central curvature radius of the image side surface of the first prism is R2, the sum of the on-axis distance from the object side surface of the first prism to the first reflecting surface and the on-axis distance from the first reflecting surface to the image side surface of the first prism is T1, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 14.61≤fp1 / fA≤96.17; -40.40≤(R1+R2) / (R1-R2)≤41.00; 0.19≤T1 / TTL≤0.

23.

7. The imaging optical lens according to claim 1, wherein: The object-side surface of the second lens is convex at the paraxial position, and the image-side surface of the second lens is convex at the paraxial position; The focal length of the camera optical lens in the first state is fA, the focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens is R3, the central curvature radius of the image side surface of the second lens is R4, the axial thickness of the second lens is T2, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 0.24≤f2 / fA≤0.38; -0.84≤(R3+R4) / (R3-R4)≤-0.62; 0.052≤T2 / TTL≤0.

066.

8. The imaging optical lens according to claim 1, wherein: The object side surface of the third lens is concave at the paraxial position, and the image side surface of the third lens is convex at the paraxial position; The focal length of the camera optical lens in the first state is fA, the focal length of the third lens is f3, the central curvature radius of the object side surface of the third lens is R5, the central curvature radius of the image side surface of the third lens is R6, the axial thickness of the third lens is T3, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -1.96≤f3 / fA≤-1.10; -11.08≤(R5+R6) / (R5-R6)≤-4.98; 0.009≤T3 / TTL≤0.

036.

9. The imaging optical lens according to claim 1, wherein: The object side surface of the fourth lens is concave at the paraxial position, and the image side surface of the fourth lens is convex at the paraxial position; The focal length of the camera optical lens in the first state is fA, the focal length of the fourth lens is f4, the axial thickness of the fourth lens is T4, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -10.6≤f4 / fA≤8.95; 0.021≤T4 / TTL≤0.

025.

10. The imaging optical lens according to claim 1, wherein: The object-side surface of the fifth lens is concave at the paraxial position, and the image-side surface of the fifth lens is convex at the paraxial position; The focal length of the camera optical lens in the first state is fA, the focal length of the fifth lens is f5, the central curvature radius of the object side surface of the fifth lens is R9, the central curvature radius of the image side surface of the fifth lens is R10, the axial thickness of the fifth lens is T5, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -6.68≤f5 / fA≤-0.38; -22.64≤(R9+R10) / (R9-R10)≤-1.06; 0.013≤T5 / TTL≤0.

035.

11. The imaging optical lens according to claim 1, wherein: The second lens is made of glass.

Images